Draft regulator



Patented May '10, 1927. 2

. UNITED, STATES PATENT OFFICE.

onammio rmcmnnor SEATTLE, wnsnmeron, ASSIGNOB oroN'n-mr' 'ro aroma m. BEAMISH, or BAKER, onneom DRAFT REGULATOR.

Application filed september 2, 1332s. serial No. 133,159.

My invention relates to draft regulators or devices designed for attachment to furnaces, stoves and the like, to secure an even regular draft pressure in thegas discharge system, thereby maintaining an even rate of. combustion in the fire and because of this, contributing to efliciency and economy in the use of the fuel.

The object of my invention is to produce a device of such character that it will be 'simple and cheap in construction .and effective in use, and in one form of the device, one which may be readily applied to the gas discharge systemof furnaces already constructed.

a very considerable extent, upon the atmospheric conditions existing at the upper or discharge end of the chimney. This results in an uneven fire and in some cases to a downward draft caused by, wind blowing into the chimney discharge, such as to force gases backwardly through the furnace.

In my present invention I establish a uniform draft condition in the furnace by pro- 7 The invention consists, in the form illusthe opening, thereby to permit inlet of air or vdischarge of gas, and provided with means whereby a constant difference in pressure between the gases in said pipe and out side thereof may be maintained.

The specific features of which my invention consists will be hereinafter set'forth in, the .specificationand then particularly defined in the claims.

The drawings accompanying herewith illustrate my invention as embodying a device intended for attachment to a pipe.

Figure 1 shows a side view of a pipe having my attachment secured thereto, this view showing a full front view of the draft regulating damper and o ening.

Fi re 2 is a side view of the device shown in Flgure .1 with the portion thereof containing the regulating damper in section.

Figure 3 is a detailed view on a larger scale of a ortion of the inner face of the draft regulating damper, illustrating the .means employed :for regulating the action thereof. Y

The ultimate purpose of my present invention is to provide means which will operate to maintain an even draft upon the 4 fire and prevent a gusty action therein. In

the operation of furnaces suchas are more particularly used for heating houses, the draft upon the furnaceat any, instant deviding, in the gas discharge system, a regulating opening and hinging therein a valve or damper, which is so weighted and balanced that it will swing inward to admit additional air when the draft on the furnace is increased and may also swing outward when the draft pressure is reversed.

The most convenient nianner of applying this device is to attach it to a gas discharge pipe and this is the plan herein illustrated in the drawings, which represent a section of such a pipe. This is provided with a hole in one side at the point where it is desired to attach my regulating device. The regulat-- ing device itself has a casing which con-. sists of a cylindrical section 2 and two cars 20, these ears being of the shape that would be'made by so cutting one end of a cylindrical casing as to enable it to fit over or against the gas discharge pipe 1.

Two strap or clampin members 21 are secured; to the points of the sections 20 and extend the rest of the way about the pipe. I

The ends of these. straps approach close to each other at the back side of the pipe 1 and have the sections 22 thereof bent outwardly at right angles. Thewhole device is then fixed to the p'p'e by-the use of clamping screws or bolts 23.

The outwardly projecting end of the casing 2 is provided with a head 3 which closes the same. For purposes of adjustment in angular position, I prefer that thehead 3 be angularly ad'ustable with reference to the casing 2. T is I have shown as being secured by providing the casing with a slight inwardly extending flange 24 and using a certain number of holding or securing bolts 25, which extend through the sides of the casing and have their nuts on the inner side ofthe casing, bearing against the inner surface of the head Three such bolts would answer satisfactorily. With such con "struction, the head 3 may be turned in the casing so as to insure that the draft open-- pends to a certain extent, and sometimes to ing therein and the controlling plate or damper 4, which is pivoted in said opening,

may be adjusted to a vcrtcal ositipn, whatever the angular position of t e pipe 1.

The disc 3, whichforms the head of the casing, is provided with a re 'lating or draft'controlling opening 30. This as illustrated, is of a square outline. iivotally mounted in this opening so that in one position it will effectively close the same. is the controlling plate 4 which constitutes the damper. This damper plate has a pivot pin 40 secured thereto at a point above the center of its vertical side. The head 3 has two cars 31, securedflthereto and provided with notches extending downward from their upper edge to receive theprojecting ends of the pivot pin or axis '40. 'As the damper plate 4 has a larger area at one "side of its pivot than at'the other. it will "easily-swing under the influence of any variations in pressure at opposite sides thereof;

As it is necessary to maintam a less pres sure on the inside of this damper than on the outside, in order to secure any draft in the chimney, means are provided whereby the tendencyof the damper would be to slightly swingoutward if the pressure. upon the two sides were e ual. To secure this result I provide a weig it'for the upper half of the plate, so positioned as to tend to swing the damper plate 4 outwardly under conditions of equili rium of pressure at opposite sides thereof. This is designed to be so adjusted that the plate 4 will hang vertically, that is, in the same plane as the head- 3, under normal conditions of draft in the furnace.

. The means preferably employed by me are such as will wei ht for varylng conditions. 1 Such means pre erably consist of a bolt 5, which has its nut secured in fixed relation. with the regulatin plate or damper 4. This nut is shown as ing held in place byslight ears or lug: 41, cut from t e adjustable plate 42. ese lugs bear against side facesof the nut and have their outer ends, slightly turned over the upper face of the nut-.1 I y ad ustmg the bolt 5 so that its center of gravity is somewhat inwardly of the amper 4, the desired result will'be secured.

The difierenoe in pressure atthe two sides of the damper 4, which will be required to of the controlling damper 4.

cause said damper to hang in the plane of the head 3, will vary with the position of this bolt, that is, with the amount of its inward projection. The greater the inward projection of the bolt, the greater will be thedifierence of pressure at the two sides The same t may be secured by a device which permits vertical adjustment of the regulating weight, that is, of the bolt 5. In fact, I prefer to employ both methods in the same construction, as this permits of permit ad'ustment of this.

axis ofsai damper-.

a greater range of adjustment. The vertical' adj ustment of the bolt is conveniently secured by mounting the nut 50 u on a plate 42, which plate is made adjusta le so 'as to vary the vertical position of the bolt.

This may be conveniently doneby pivoting the plate 42 upon a bolt as 6 which functions both as a pivot bolt and a clamping means, so that the end thereof which carries the bolt 5 may swing in a vertical plane.

When this is done a slot as 44 shpuld be provided in the regulating damper .4, this being positioned concentric with the pivot bolt 6.

In applying my device to a furnace, a hole is cut in a pipe which forms a part of the tion by the insertion and tightening of the clamping bolts 23. The cutting of the hole in the pipe 1 requires no accuracy of workmanship. This hole would naturally not need to be larger than the hole 30 in the head 3 and this is, much smaller than thearea of the pipe 1 covered by the casing 2. The regulating means carried by the controlling damper 4 are theuadjusted to secure the intensity of draft desired. Such ad ustment may also be made at any t1me while the furnace is in use. At times a very slight draft only is wanted, as for instance m mild weather, whereas in cold weather a stronger draft is desired. The device ap lied to'a furnace will maintaimuniform raft' conditions therein at all times.-

Adjustment of "the device may be made I which will prevent more than a very slight draft upon the fire, therebgl prevent ng strong burning of the fuel, t us adapting it to mild weather conditions and preventing overheating of the building as well as saving of fuel. What I claim as my invention 1s:

1. A draft regulator for furnaces comprising a casing having strap members adapted to pass over the smoke plpe, means for drawing together the ends 0 members, said casingzhaviig a draft opening and a pressure controll damper m the opening.

- g 2. A- draft regulator for furnaces adapted to be secured to the smoke pipe and having a pressure-equalizing damper opemng,

damper said opening to swing in either direction from its closed position, and a regulating weight provided with means for mo it towards and from the hinge said strap 3. in, a draft regulator for 'furnaces, a pressure opei ated'hinged damper, an arm pivoted on the damper to swing toward and from the hinge axis, means" for securing said arm in, adjusted position, and a weight carried ,by the swin ing end of said'arm and adjustable to ift its" center of gravity in a direction normal to tire plane of the damper.

4. In a draft regulatorv for furnaces yof the type employing a damper swingi in an opening, a regulating weight on the. ampei and means for, ad'usting saidweight both in the plane of the amper and normal-to said plane. V 7 5..In a "draft regulator for furnaces, a casing adapted to be secured to be in communication with the gas discharge from a furnace, said casing having a pressure compensating opening, a damper hinged in said opening to swing both ways from its closing position, the ivot axis of said damper being located a ove the center of its vertical width, and a weight carried by said damper above itslpivot axis and means for adjusting said weight towards and from said pivot axis.

6'. In a draft regulator for furnaces, a

casing adapted to be secured to be in com-- munication with the gas discharge from a furnace, said ,casing having a pressure com pensating opening, a damper hinged in said opening to swing both ways from its closing position,'the ivot axis of said damper being located a ove the center of its vertical width, an arm-pivoted to the damper above its pivot axis to swing vertically and extending in a general horizontal direction, the damper having a slot covered by the swinging end of said arm, means for securing'said arm in adjusted positions and a weight threaded in said arm to be adjusted'normal to the damper and passing throu h said slot.

7. In a draft regulator for t e gas discharge systems of furnaces, a casing adapted to be secured in communication with the gas dlscharge system, a plate secured to form a partof the wall of said casing, means for adjusting said plate turning in its plane,

said plate having a aft regulating opening, and a regulating damper comprising a plate hinged in'and to swing throu' h said opening, and means for adjusting t e center of gravity of said damper'plate laterally of its pivot axis.

8. In a draft regulator for the gas dis- 'charge systems of furnaces, a casing adaptday of August 1926.

dHANNING PRICHARD. 

